Give me one good reason why I should help you.

我为什么要帮你？给我一个充分的理由。

《牛津词典》

I had no reason to doubt him.

我没有理由不相信他。

《牛津词典》

I have good reason to be suspicious.

我的怀疑有充分理由。

《牛津词典》

"I have lots of friends that came to U.S.C. That is the main reason I wanted to come.

VOA: special.2010.05.27

Suppose I reason and say if we, me and my pair, both reason this way and choose Alpha then we'll both get 0.

假如我和我队友都这么想,如果我们都选α我们得到0单位效用

耶鲁公开课 - 博弈论课程节选

I guess, I, I think the reason I did is because about the time to do it is college, I think.

我想，我认为我这么做，是因为大学该是时候这么做了。

留学的优点是？ - SpeakingMax英语口语达人

They are quite close to the ground, I reason, and so the work is less uncomfortable.

ECONOMIST: Travels among the Ticuna

So the reason I'm asking, Mr Rjoub, the reason I'm asking about the framing is were you aware of any pupils or staff putting these frames together?

BBC: [an error occurred while processing this directive]

So the bad grades were one reason I quit English, but there was an-other reason, a bigger reason: I couldn't shake the feeling that there was something else I should be doing, something I hadn't tried or considered, something new and better.

NPR: Chapter 1